It's time to be pitiless against the bankers and against the people who
invest in murder to assure their own survival in power. Assets from
these states should be frozen, all over the west. Money trails should be
followed, wherever they lead. People should go to jail, in every
country in the world. It should be done state-to-state. Stop funding the
murder of our citizens and you can have your money back. Maybe. If
we're satisfied that you'll stop doing it. And, it goes without saying,
but we'll say it anyway – not another bullet will be sold to you, let
alone advanced warplanes, until this act gets cleaned up to our
satisfaction. If that endangers your political position back home,
that's your problem, not ours. You are no longer trusted allies.
Complain, and your diplomats will be going home. Complain more loudly,
and your diplomats will be investigated and, if necessary, detained.
Retaliate, and you do not want to know what will happen, but it will
done with cold, reasoned and, yes, pitiless calculation. It will not be a
blind punch. You will not see it coming. It will not be an attack on
your faith. It will be an attack on how you conduct your business as
sovereign states in a world full of sovereign states.

The Saudi royals would be gone in short order if their money stopped. But they're not the only ones. We're going to sign a treaty with Iran and lift the sanctions imposed on them for their nuclear program, and yet they remain principal funders of Hezbollah etc. Who's buying Daesh's black market oil? Sanction them, too.

Actually, last night I heard a piece on Marketplace that said that ISIS raises money through taxes on people in the areas it controls, through black market oil sales, and through the sale of smuggled artifacts. So I am somewhat off base here-- but I think the larger point remains.